Fire control module out of the four wires connected to how the air pressure delivery. The module out of the four lines, two control lines electric multi-leaf smoke vents, and the other two is the signal feedback line remote control multi-leaf smoke vents, control lines connected normally open contact. Thus, even when a few fans stairway door open, can guarantee uniform air transported to the shaft to go. Also leafy exhaust port to pick four lines. The first is the control line, generally for the implementation of the terminals 1,2 No. I control the sheets, connect DC24V power leafy exhaust port, it is the action (smoke vents open); then is the signal return line, usually 4, 5, 6 is a set of passive signal return micro-switches, 5 is the common point, and then return the data signal with the requirements of the option of connecting 4 or 6. Here cooling tower: its water circulation path galvanized sheet multi-leaf smoke vents, the addition of a turbine will certainly increase resistance, resistance to increased water flow is reduced, but also affect the normal operation of heat transfer equipment. Zhenjiang City, leafy exhaust port _ remote control _ Echo leafy exhaust port is provided by air conditioning Famous Trademark Ltd Echo Texas air-conditioning equipment. Echo Texas Air Conditioning Equipment Co. (www.aikekt.cn) is specialized in the "central air-conditioning equipment", the company adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Wu.